Here \(m=M/M_S\)  represents the normalized magnetization, \(h_{\textnormal {eff}}=H_{\textnormal {eff}}/M_S\)  the effective field, i.e. the negative variational derivative of the total magnetic free energy with respect to \(m\) , both normalized by the spontaneous magnetization \(M_S\) . For gyromagnetic ratio \(\gamma \)  and saturation magnetization \(M_S\)  the time is measured in units of \((\gamma M_S)^{-1}\) , and it is assumed that the temperature of the magnetic body is constant and below the Curie temperature [1]}. Finally, Gilbert damping \(\alpha >0\)  turns \(m\)  towards \(h_{\textnormal {eff}}\)  and both vectors are parallel in the static solution.
